<script setup lang="ts">
import { computed, ref, watch } from 'vue'

// 定义水果对象
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}

let fruits = ref<Fruit[]>([])

const localFruitsKey = 'fruits'

const setFruits = () => {
  fruits = ref<Fruit[]>([
    {
      id: 1,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
      isChecked: true,
      num: 2,
      price: 6,
    },
    {
      id: 2,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
      isChecked: false,
      num: 7,
      price: 20,
    },
    {
      id: 3,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
      isChecked: false,
      num: 3,
      price: 40,
    },
    {
      id: 4,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
      isChecked: false,
      num: 10,
      price: 3,
    },
    {
      id: 5,
      icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
      isChecked: false,
      num: 20,
      price: 34,
    },
  ])
}

const resetData = () => {
  fruits.value = []
  setFruits()
}

const res = localStorage.getItem(localFruitsKey)
if (res) {
  fruits.value = JSON.parse(res)
} else {
  setFruits()
}

watch(
  () => fruits,
  (newVal) => {
    localStorage.setItem(localFruitsKey, JSON.stringify(newVal.value))
  },
  { deep: true },
)

const add = (id: number) => {
  fruits.value.find((item) => item.id === id)!.num++
}

const decrease = (id: number) => {
  const fruit = fruits.value.find((item) => item.id === id)!
  if (fruit.num > 1) {
    fruit.num--
  }
}

const del = (id: number) => {
  fruits.value = fruits.value.filter((item) => item.id !== id)
}

const toggleSelectAll = computed({
  get() {
    return fruits.value.every((item) => item.isChecked)
  },
  set(value: boolean) {
    fruits.value.forEach((item) => {
      item.isChecked = value
    })
  },
})

const totalCount = computed(() => {
  return fruits.value.filter((item) => item.isChecked).reduce((total, item) => total + item.num, 0)
})

const totalPrice = computed(() => {
  return fruits.value
    .filter((item) => item.isChecked)
    .reduce((total, item) => total + item.num * item.price, 0)
})
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box">
      <img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruits.length > 0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div v-for="item in fruits" class="tr" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td">
              <img :src="item.icon" alt="" />
            </div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="decrease(item.id)" :disabled="item.num <= 1">
                  -
                </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="add(item.id)">+</button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="toggleSelectAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box"
            >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span
          >
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div @click="resetData" class="empty" v-else>🛒空空如也</div>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>
